using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Plugins.Countly
{
    public class MonoSingleton<T> : MonoBehaviour where T : MonoSingleton<T>
    {
        private static T m_Instance;

        private static bool _isInitialized;

        public static T Instance
        {
            get
            {
                // Instance requiered for the first time, we look for it
                if (m_Instance == null)
                {
                    m_Instance = FindObjectOfType(typeof(T)) as T;

                    // Object not found, we create a temporary one
                    if (m_Instance == null)
                    {
                        Debug.LogWarning("No instance of " + typeof(T) + ", a temporary one is created.");

                        isTemporaryInstance = true;
                        m_Instance = new GameObject("Singleton of " + typeof(T).Name, typeof(T))
                            .GetComponent<T>();

                        // Problem during the creation, this should not happen
                        if (m_Instance == null) Debug.LogError("Problem during the creation of " + typeof(T));
                    }

                    if (!_isInitialized)
                        _isInitialized = true;
                    // m_Instance.Init();
                }

                return m_Instance;
            }
        }

        public static bool isTemporaryInstance { private set; get; }

        // If no other monobehaviour request the instance in an awake function
        // executing before this one, no need to search the object.
        private void Awake()
        {
            if (m_Instance == null)
            {
                m_Instance = this as T;
            }
            else if (m_Instance != this)
            {
                Debug.LogError("Another instance of " + GetType() + " is already exist! Destroying self...");
                DestroyImmediate(this);
                return;
            }

            if (!_isInitialized)
            {
                DontDestroyOnLoad(gameObject);
                _isInitialized = true;
                m_Instance.Init();
            }
        }


        /// <summary>
        ///     This function is called when the instance is used the first time
        ///     Put all the initializations you need here, as you would do in Awake
        /// </summary>
        protected virtual void Init()
        {
        }

        /// Make sure the instance isn't referenced anymore when the user quit, just in case.
        protected virtual void OnApplicationQuit()
        {
            m_Instance = null;
        }
    }
}